Question

6. (1 pt) Which represents an ENDOTHERMIC reaction? a. 10 kJ + reactants - products b. reactants-> products + 10 kJ C reactants - products d. reactants-products 7. (1 pt) Which represents a reaction that requires a catalyst? a. 10 kJ + reactants-> products b. reactants -> products + 10 kJ c. reactants products d. reactants-> products 8. (1 pt) Which represents reversible reaction? a. 10 kJ + reactants -> products b. reactants-> products + 10 kJ C. reactants products d. reactants --> products 9. (2 pts) These equations are NOT correctly balanced according to our guidelines for balancing. Please explain why. equation Why is the equation NOT correctly balanced? a. Al(s) + 3/2 Br2 (9) -> AIBr; (3) b. 2 N2(g) +6 Hz (E) > 2 NH3(g) 10. (18 pts) Balance the following equations. equation a.__ LiOH (aq) +_ Fe(NO3) (aq) -->_Fe(OH) (s) + _LINO, (aq) b. ___ CsH120(g) + _ 02 (g) _CO2(g) + _H2O(g) c. _KCIO, (s) > _KCI (s) + _02(g) d. ___ NH3(g) + __ H2SO4 (aq) -> _ (NH4)2SO4 (aq) e. _ Zn (s) + _HCI (aq) → _ZnCl2 (aq) + _H2(g)

Answer 1

Q6) When heat is absorbed in the reaction, the reaction is called as endothermic reaction.
Option b) heat is given out, hence it is exothermic.
Option c) It is just an equilibirium
Option d) It is just the catalytic reaction
Answer is option a) where 10kJ of heat is used to give product.

Q7) The reaction where Pt is written on the reaction arrow, is the catalystic reaction. Hence answer is option d).

Q8) Double half-headed arrow represents reversible reaction.
Hence answer is option c).

Q9) a) Al(s) + 3/2 Br2(l) ----> AlBr3
The Br2 molecule is diatomic and hence 3/2 does not provide any actual number of molecules. In the balanced equation, the coeeficient need to to be integer. Hence the balanced reaction is:
2Al(s) + 3 Br2(l) ----> 2 AlBr3

b) 2N2(g) + 6H2(g) ----> 2NH3(g)
The number of N is not balanced.
the balanced reaction is:
N2(g) + 6H2(g) ----> 2NH3(g)

10) a)
3 LiOH(aq) + Fe(NO3)3(aq) ----> Fe(OH)3(s) + 3 LiNO3(aq)

b)
2 C5H12O(g) + 15 O2(g) ----> 10 CO2(g) + 12 H2O(l)

c)
2 KClO3(s) ----> 2 KCl(s) + 3 O2(g)

d) 2NH3(g) + H2SO4(aq) -----> (NH4)2SO4(aq)

e) Zn(s) + 2 HCl(aq) ----> ZnCl2(aq) + H2(g)